It was a small detail, a point of comparison buried in the fifth paragraph on the 17th page of a 24-page summary of the 2009 American Religious Identification Survey. But as R. Albert Mohler Jr.—president of the Southern Baptist Theological Seminary, one of the largest on earth—read over the document after its release in March, he was struck by a single sentence. For a believer like Mohler—a starched, unflinchingly conservative Christian, steeped in the theology of his particular province of the faith, devoted to producing ministers who will preach the inerrancy of the Bible and the Gospel of Jesus Christ as the only means to eternal life—the central news of the survey was troubling enough: the number of Americans who claim no religious affiliation has nearly doubled since 1990, rising from 8 to 15 percent. Then came the point he could not get out of his mind: while the unaffiliated have historically...
